Human Body Overview Study Guide


The human body is one single structure that is made of smaller networks. They are grouped hierarchically as systems, organs, tissues, and cells. The organ system performs a complex function, and consists of different organs arranged systematically.

Organs are part of different body systems consisting of various tissues grouping themselves into complex structures that perform one or more simple functions that help complete the organ system’s complex process. Tissues are groups of similar cells that perform a single function that forms an organ together with other tissues.

What are the Systems of the Body?

There are ten different body systems. The central body systems are skeletal, nervous, muscular, endocrine, circulation, digestive, respiratory, reproductive, and urinary.

All the body systems perform one single complex function:

  • The reproductive system propagates
  • The respiratory system breathes or gas exchange
  • The urinary system removes waste products and purifies blood
  • The circulatory system maintains the blood flow
  • The endocrine system controls the hormonal balance
  • The digestive system extracts nutrients from the food consumed
  • The muscular system helps in body movement
  • The nervous system responds to the environment
  • The skeletal system provides support and framework to the human body.

Anatomy of the Human body:

Anatomy refers to the science that elaborates on the inner structure of the human body. The human body is divided into various regions such as the head, neck, chest or thorax, arms or hands, abdomen, legs or limbs, back, and pelvis. These regions constitute the vital organs that perform various functions.

The vital organs located in these regions of the body: the brain in the head, spine in the neck and back, lungs and heart in the thorax, stomach, liver, gallbladder, pancreas, spleen and intestines in the abdomen, urinary bladder, kidneys, and uterus or testes in the pelvis.

Human body anatomy


The body’s anatomy divides the positioning of the organs and their systems in the body based on the direction. Several directions are defined for the human body, as shown in the picture above.


  • The human body is the most complex form of life.
  • It can be easily understood by knowing the effective systems that perform the primary functions and locating the vital organs that perform life-sustaining functions.


1. What are the basics of the human body?

The basics of the human body are the microscopic structure, or the fundamental unit of life is the cell that groups into tissues, organs, and organ systems.

2. What are the 7 levels of organization in the human body?

The 7 levels of organization in the human body start from the basic structure of life are: the atom, molecule, organelles, cell, tissues, organ, organ system, and the human organism.

3. What are the 11 major body parts of the human body?

The 11 major body parts of the human body are the brain, heart, lungs, stomach, intestines, kidney, liver, uterus or testes, spine, pancreas, and extremities (arms and legs).

4. What are the 12 systems of the body?

The body’s systems are circulatory, nervous, digestive, respiratory, muscular, reproductive, urinary, skeletal, endocrine, immune, cardiovascular, and integumentary.

5. What are the 78 organs in the human body?

The 78 organs in the human body are:

  1. Anus
  2. Arteries
  3. Appendix
  4. Adrenal glands
  5. Brain
  6. Bones
  7. Bronchi
  8. Bladder
  9. Bone marrow
  10. Bulbourethral glands
  11. Colon
  12. Cervix
  13. Clitoris
  14. Capillaries
  15. Cerebellum
  16. Diaphragm
  17. Ears
  18. Eyes
  19. Fallopian tubes
  20. Genitals
  21. Gallbladder
  22. Heart
  23. Hair follicle
  24. Hypothalamus
  25. Interstitium
  26. Kidneys
  27. Joints
  28. Liver
  29. Lungs
  30. Larynx
  31. Ligaments
  32. Lymph nodes
  33. Large intestine
  34. Lymphatic vessel
  35. Mouth
  36. Mesentery
  37. Mammary glands
  38. Nose
  39. Nails
  40. Nerves
  41. Nasal cavity
  42. Ovaries
  43. Esophagus
  44. Penis
  45. Pancreas
  46. Pharynx
  47. Placenta
  48. Prostate
  49. Pineal gland
  50. Pituitary gland
  51. Parathyroid gland
  52. Rectum
  53. Skin
  54. Spleen
  55. Scrotum
  56. Stomach
  57. Spinal cord
  58. Small intestine
  59. Salivary glands
  60. Skeletal muscles
  61. Seminal vesicles
  62. Subcutaneous tissues
  63. Teeth
  64. Tonsils
  65. Testes
  66. Tendons
  67. Tongue
  68. Thyroid
  69. Trachea
  70. Thymus gland
  71. Ureters
  72. Urethra
  73. Uterus
  74. Vulva
  75. Veins
  76. Vagina
  77. Vas deferens
  78. Vestigial organs

6. What is the largest organ in the body?

Skin is the largest organ in the body. It is evident because it has to cover the entire outer surface of the body.

7. What is the smallest organ?

The pineal gland is the smallest organ in the body that helps in regulating the female reproductive fertility cycles.

8. Which organ of the body works 24 hours?

The brain, the lungs, and the heart are the vital organs of the body that work 24 hours to sustain life.

9. What is skin made of?

The skin is made of cells composed of water, protein, fats, and minerals. The three layers of skin are the epidermis, dermis, and hypodermis.

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  1. Review: Introduction to the Human Body.,can%20perform%20a%20special%20function. Accessed 23 Nov, 2021.
  2. Anatomy. Accessed 23 Nov, 2021.
  3. Human Body. Accessed 23 Nov, 2021.
  4. Human Body. Accessed 23 Nov, 2021.

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